Violet's possession shenanigans is already in the game, kinda, it's tied to her questline ( ′v‵ )
Oh! I hadn't actually gotten that far until...well, right now actually, I had just assumed (since I saw nobody talking about it) that the most possession content there was, was just Violet possessing girls for you.
It's nice to find out that the content I like the most (m to f possession) is in the game already, at least in one situation (I've only gotten to, I assume, the first one at school)